Pipe-wrench



J. C. SPROULL. PRB WRENCH.

No. 444,372. "Patented Jan. 6, 1891.

FEE-:

I Mis:

l I y I Illi- UNITED STATES PATENT OFFICE.

JOHN O. SPROULL, OF BEDFORD, INDIANA.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 444,372, dated January 6, 1891.

Application led October 4, 1890. Serial No. 367.123. (No model.)

.To all whom, t may concern:

Be it known that I, JOHN C. SPROULL, of

Bedford, county of Lawrence, and State of In-v ingthe position Of the parts when gripping.

a smaller pipe. Fig. 3 is a top View of the same. Fig. 4 is a central section through the jaw and pivot, the shank being in full lines.

In detail, s is the shank, having a hole for the pivot p, on which the jawj swings. The upper end of the shank is curved outwardly and toothed at t, as shown. These teeth are preferably graduated in size, the'coarsest being at the bottom and the finest at the top, the advantage of this being that when small pipe-sections are to be gripped the small teeth being more `numerous will grip and hold the pipe better than larger ones. j is a jaw which is pivoted to the shank at p, and has hooks h at its Outer end for gripping the pipe. This jaw is recessed below the top, as shown in Fig. 4, to admit the curved top of the shank when the wrench is closed. The inside of the jaw is irregularly curved, the lower part 2 being somewhat rounded, while Ithe upper part 1 is nearly straight, furnishing a squared bearing for the pipe-section, thus giving a better grip on the pipe, and the latter will not slip or slide as it is likely to do when the top curve is more rounded. The hooks h on the end of this jaw abut more or less against the periphery of the pipe-section,

as shown in Figs. 1' and 2.

The construction herein shown allows the Wrench to be used with different sizes of pipe without changing the parts, and the jaw swings loosely and easily upon the pivot p, so that when pressure upon the end of the shank is released the jawj drops away from the pipe, and there is no locking of the parts, asistoo often the case with Ordinary wrenches.

I am aware that pipe-wrenches have been made with shanks curved at the top, with teeth, and having swinging jaws, and I do not broadly claim the same as my invention; but

IVhat I do claim, and desire to secure by Letters Patent, is the following:

1. A pipe-wrench comprising a shank, its upper end outwardly curved and toothed on its inner face, a recessed jaw pivoted thereto, its inner face irregularly curved, and hooks formed on the outer end thereof, substantially as described.

2. A pipewreuch comprising a shank, its upper end outwardly curved and toothed, a recessed jaw having one or more hooks on its outer end for gripping the pipe, the inner face of the jaw irregularly curved,the upper part of such curve approximating a straight line, substantially as described.

3. A pipe-wrench comprising a shank, its upper end outwardly curved and having graduated teeth on its inner face, a recessed jaw having hooks on its outer end for gripping the pipe, the inner face of such jaw formed in curves, the upper one of which approximates a straight line, substantially as shown and described.

In witness whereof I have hereunto set my hand this 27th day of September, 1890.

JOHN 0. SPROULL.

Witnesses:

C. P. J AOOBs, I-I. D. NEALY. 

